Small diameter holes with less spacing shall result in better fragmentation. Lesser the spacing, better the fragmentation. However, it is difficult to get rid of embedded boulders; in that case secondary blasting is the appropriate alternative.
A. K. Mukherjee
Ex. Chief Manager (Excavation)
Northern Coalfields Ltd
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Posted by: ASHIM KUMAR Mukherjee <akm1954mukherjee@gmail.com>
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Directorate General of Mines Safety, Ministry of Labour & Employment, Govt. of India
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